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Viewing the Proton Through "Color"-Filters

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arxiv hep-ph/0304037 v3 pith:DKH42F7F submitted 2003-04-04 hep-ph

Viewing the Proton Through "Color"-Filters

classification hep-ph
keywords distributionsprotonmomentumpartoncolorfiltersphase-spaceappropriate
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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While the form factors and parton distributions provide separately the shape of the proton in coordinate and momentum spaces, a more powerful imaging of the proton structure can be obtained through phase-space distributions. Here we introduce the Wigner-type quark and gluon distributions which depict a full-3D proton at every fixed light-cone momentum, like what seen through momentum("color")-filters. After appropriate phase-space reductions, the Wigner distributions are related to the generalized parton distributions (GPD's) and transverse-momentum dependent parton distributions which are measurable in high-energy experiments. The new interpretation of GPD's provides a classical way to visualize the orbital motion of the quarks which is known to be the key to the spin and magnetic moment of the proton.

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Forward citations

Cited by 9 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

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    hep-ph 2025-12 unverdicted novelty 7.0

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  2. Parton distributions in the shockwave formalism

    hep-ph 2025-10 conditional novelty 7.0

    A single shockwave Feynman-rule framework reproduces and extends prior small-x parton distributions, yielding new quark GTMD/GPD/PDF and diffractive-TMD results.

  3. Gluon GTMD at strong coupling: fixed-spin saddle factorization and Reggeization

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  4. Azimuthal decorrelation in diffractive dijet production

    hep-ph 2026-06 unverdicted novelty 6.0

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  5. Collinearly Improved Balitsky-Kovchegov Evolution of the Gluon Wigner Distribution

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  6. Collinearly Improved Balitsky-Kovchegov Evolution of the Gluon Wigner Distribution

    hep-ph 2026-06 unverdicted novelty 5.0

    Collinearly improved BK evolution shifts the elliptic node position and alters the rapidity and hard-scale dependence of the coherent dijet cos2φ signal rather than producing a simple normalization change.

  7. On the Two $R$-Factors in the Small-$x$ Shockwave Formalism

    hep-ph 2026-04 unverdicted novelty 5.0

    Replacing the rapidity argument of the dipole amplitude with ln min{1/|x|, 1/|ξ|} and refining initial conditions for non-linear evolution can eliminate two R-factors in small-x shockwave calculations.

  8. T-odd Wigner Distributions in boost-invariant longitudinal position space and Spin-momentum correlation in proton

    hep-ph 2024-08 unverdicted novelty 5.0

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  9. GTMDs, orbital angular momentum, and pretzelosity

    hep-ph 2026-05 unverdicted novelty 4.0

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